EP0330976B1 - Procédé de fabrication d'un plâtre à partir d'une masse fluide pouvant être rapidement recouvert après la pose - Google Patents

Procédé de fabrication d'un plâtre à partir d'une masse fluide pouvant être rapidement recouvert après la pose Download PDF

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Publication number
EP0330976B1
EP0330976B1 EP89103028A EP89103028A EP0330976B1 EP 0330976 B1 EP0330976 B1 EP 0330976B1 EP 89103028 A EP89103028 A EP 89103028A EP 89103028 A EP89103028 A EP 89103028A EP 0330976 B1 EP0330976 B1 EP 0330976B1
Authority
EP
European Patent Office
Prior art keywords
flooring
drying
mass
ready
maximum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89103028A
Other languages
German (de)
English (en)
Other versions
EP0330976A3 (fr
EP0330976A2 (fr
Inventor
Heinz Dipl.-Phy. Dr. Ruf
Franz Dipl.-Chem. Dr. Wirsching
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knauf Gips KG
Original Assignee
Gebr Knauf Westdeutsche Gipswerke
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebr Knauf Westdeutsche Gipswerke filed Critical Gebr Knauf Westdeutsche Gipswerke
Priority to AT89103028T priority Critical patent/ATE82562T1/de
Publication of EP0330976A2 publication Critical patent/EP0330976A2/fr
Publication of EP0330976A3 publication Critical patent/EP0330976A3/fr
Application granted granted Critical
Publication of EP0330976B1 publication Critical patent/EP0330976B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
    • C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/60—Flooring materials
    • C04B2111/62—Self-levelling compositions

Definitions

  • the invention relates to a process for the production of a screed ready for covering, in which a flowing screed mass composed of ⁇ -calcium sulfate hemihydrate as the sole binder, inert additive material, liquefier, retarder and water is mixed, poured and, after setting, allowed to dry until ready for covering, the screed being left with a residual moisture of maximum 1% by weight and a compressive strength of at least 25 N / mm2.
  • a screed is ready for covering after it has been manufactured or installed, if it is sufficiently firm and dry for covering with a top covering.
  • a screed that is ready for early covering is understood to mean a screed that suitable for occupancy a few days after installation or after manufacture.
  • Such screeds that are ready for early covering are known to be made with dry screed, which is laid, glued and filled in the form of a plate, with quick cement screed, which is processed earth-moist and which chemically binds all the mixing water during hardening, with mastic asphalt or with reaction plastic.
  • Self-leveling screeds so-called flowing screeds, are processed with a flowable consistency, which is adjusted by adding an appropriate amount of water to the dry mortar.
  • the water addition is always so high that the water is not completely chemically bound by the setting reaction when the mortar sets.
  • each self-leveling screed has to dry to reach its maturity.
  • a gypsum-based screed ready for covering may have a residual moisture of maximum 1% by weight and should meet strength class 20 when installed in residential buildings, ie it must have a series compressive strength of at least 25 N / mm2 according to the quality test according to DIN 18560.
  • the drying of the liquid screeds on the market with gypsum-based binders usually takes about three to four weeks, which delays the progress of the construction. This long drying time is disadvantageous when short construction times, such as in renovation or prefabricated house construction, are required.
  • Drying measures are understood here to mean additional measures which promote the escape of water from the building structure and which consist, for example, of supplying heat and / or aeration.
  • gypsum-based liquid screeds currently have synthetic anhydrite as a binder. Drying measures cannot be carried out on these liquid screeds because they lead to cracks in the drying screed and reduce the strength properties.
  • a known (DE-OS 26 31 031) method of the type mentioned uses ⁇ -calcium sulfate hemihydrate as a binder and is not carried out in practice because ⁇ -calcium sulfate hemihydrate obtained from natural gypsum is considerably more expensive than synthetic anhydrite. If quartz sand is used as the inert aggregate material, the machines used to produce the dry mortar and to process the liquid screed mass are heavily worn, making the process even more expensive becomes.
  • the invention provides a method of the type mentioned at the outset, which is characterized in that, apart from the mixing with water, a dry mortar is mixed with a maximum of 50% by weight of ⁇ -calcium sulfate hemihydrate resulting from the desulphurization of flue gas Gypsum obtained in the continuous autoclave process, and limestone as an aggregate, which is free of a fine grain content below 40 microns, and that an apparatus drying measure is carried out on the set liquid screed.
  • Drying is accelerated by the selected composition and the drying measure, so that disadvantageous construction delays are avoided and the readiness for covering is reached earlier than before.
  • Flowing screed with ⁇ -calcium sulfate hemihydrate as a binder sets very quickly after processing.
  • the retarder is dosed so that there is a processing time of at least 60 minutes and the setting reaction is complete after eight hours at the latest, so that the hardened screed can be dried in a short time without disadvantages such as loss of strength or cracking.
  • the ⁇ -calcium sulfate hemihydrate which is obtained from the gypsum obtained from flue gas desulphurization, has a high degree of purity and therefore achieves very little strength when set.
  • the ⁇ -calcium sulfate hemihydrate obtained from flue gas gypsum using the continuous autoclave process is more economical to manufacture and therefore cheaper than that obtained from natural plaster.
  • the use of this ⁇ -calcium sulfate hemihydrate extends the disposal capacity for the gypsum obtained in flue gas desulfurization.
  • Drying is slowed down by adding synthetic anhydrite, cement, hydrated lime or alkali sulfates, which are used as stimulants in anhydrite flow screeds or in gypsum casting and flowing compounds to control the setting expansion.
  • non-inert additives such as latent hydraulic slag sands
  • Dehydration is also delayed if sedimentation preventers, such as methyl cellulose, are used, as they usually increase water retention.
  • the method according to the invention is more economical because time is saved by using drying measures. It is particularly useful and advantageous if the time from pouring the self-leveling screed (approx. 20% by weight of free moisture) to readiness for covering (max. 1% by weight of free moisture) when using the drying measure a maximum of half the time to let it dry under normal conditions with 20 ° C and 85% relative humidity. With the self-leveling floor screed described, the drying measures can be carried out with an intensity without adverse effects, which results in a particularly pronounced time saving.
  • the drying measure consists, for example, in a ventilation by means of an air flow generated by a fan or in a heating by means of a heater or when extracting moisture from the ambient air using a room dehumidifier. It is particularly expedient and advantageous if the set floating screed mass is heated to dry by means of underfloor heating.
  • the underfloor heating which is present anyway, warms the liquid screed from the inside and expels the moisture.
  • the floating screed mass generally contains 35-50% by weight of ⁇ -calcium sulfate hemihydrate, 50-65% by weight of inert limestone and a maximum of 1% by weight of liquefier, retarder and optionally other additional components in the dry matter. Water should be added within a preferred water / solids ratio of 0.15 - 0.25. It is particularly expedient and advantageous if the leveling screed mass is set at a water solids ratio of 0.17-0.23.
  • Limestone is used as an inert aggregate, which causes less wear and tear during production and processing than, for example, quartz sand.
  • the grain size of the aggregate is larger than 40 ⁇ m and smaller than 1.4 mm.
  • 95% of the ⁇ -calcium sulfate hemihydrate should have a particle size of less than 90 ⁇ m, which promotes self-leveling.
  • the ⁇ -calcium sulfate hemihydrate with a bedding quantity of more than 250 g per 100 ml water according to DIN 1168.
  • the compressive strength of the screeds is 17 - 19 N / mm2 8 hours after processing and 28 - 32 N / mm2 after drying.
  • Example 1 A 35 mm thick screed area, housed in a room, made from a mixture of 50 pbw of ⁇ -calcium sulfate hemihydrate and 50 pbw of limestone with a liquefier and retarder, which is processed to flow and can only dry upwards, reaches 20 ° C on storage C and an average of 85% relative humidity after 7 days a residual moisture of 4% and only after 16 days of less than 1%. With a maximum of 1% residual moisture, the readiness for covering for steam-open coverings (textiles, tiles) is reached.
  • Example 2 A screed area accommodated in a room according to Example 1 reaches a residual moisture of less than 1% after 7 days with ventilation and ventilation, so that 20 ° C. and 65% relative atmospheric humidity prevail.
  • Example 3 A 35 mm thick screed area, which is housed in a room and heated by underfloor heating at a flow temperature of 35 ° C, made with a mixture according to Example 1, already reaches a residual moisture of less than 1% after 4 days.
  • Example 4 A 35 mm-thick screed area, which is housed in a closed room, produced with a mixture according to Example 1, already reaches after 5 using a room dehumidifier Days a residual moisture of less than 1%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Civil Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Road Paving Machines (AREA)

Claims (5)

  1. Procédé de fabrication d'un plâtre apte à être recouvert, dans lequel une masse de plâtre fluide constituée par du sulfate de calcium α semihydraté en tant qu'unique liant, un additif inerte, un fluidifiant, un retardateur et de l'eau, est coulée et, après la prise, mise à sécher jusqu'à ce qu'elle soit apte à être recouverte, le plâtre présentant une humidité résiduelle d'au plus 1 % en poids et une résistance à la pression d'au moins 25N/mm², caractérisé en ce que, séparément du gâchage à l'eau, un mortier sec est mélangé, et ce avec au maximum 50% en poids de sulfate de calcium α semihydraté qui est obtenu dans le procédé de traitement continu en autoclave à partir du gypse formé au cours de la désulfuration des gaz de fumée, et un additif qui est un calcaire dépourvu d'une fraction de grains fins inférieure à 40,µm, et en ce que la masse de plâtre fluide prise est soumise à une opération de séchage effectuée à l'aide d'un appareillage.
  2. Procédé selon la revendication 1, caractérisé en ce que la durée du séchage depuis la coulée de la masse de plâtre fluide (environ 20 % en poids d'humidité libre) jusqu'à l'état d'aptitude au recouvrement (au maximum 1 % en poids d'humidité libre) lors de l'opération de séchage représente au plus la moitié de la durée du séchage spontané dans les conditions normales d'une température de 20°C et d'une humidité relative de l'air de 85 %.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la masse de plâtre fluide prise est chauffée par un chauffage par le sol pour le séchage.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que, lors d'une opération de séchage par la chaleur, la température de la masse de plâtre fluide prise est de 55°C au maximum.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la masse de plâtre fluide présente dans la matière sèche au moins 35 % en poids de sulfate de calcium α semihydraté et au plus 65 % en poids d'additif et est réglée à un rapport eau-matière solide de 0,17 à 0,23.
EP89103028A 1988-03-03 1989-02-21 Procédé de fabrication d'un plâtre à partir d'une masse fluide pouvant être rapidement recouvert après la pose Expired - Lifetime EP0330976B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89103028T ATE82562T1 (de) 1988-03-03 1989-02-21 Verfahren zur herstellung eines belegereifen estrichs aus fliessestrichmasse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3806854 1988-03-03
DE3806854A DE3806854A1 (de) 1988-03-03 1988-03-03 Verfahren zur herstellung eines belegereifen estrichs aus fliessestrichmasse

Publications (3)

Publication Number Publication Date
EP0330976A2 EP0330976A2 (fr) 1989-09-06
EP0330976A3 EP0330976A3 (fr) 1991-08-07
EP0330976B1 true EP0330976B1 (fr) 1992-11-19

Family

ID=6348705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103028A Expired - Lifetime EP0330976B1 (fr) 1988-03-03 1989-02-21 Procédé de fabrication d'un plâtre à partir d'une masse fluide pouvant être rapidement recouvert après la pose

Country Status (3)

Country Link
EP (1) EP0330976B1 (fr)
AT (1) ATE82562T1 (fr)
DE (2) DE3806854A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007045059A1 (de) * 2007-09-20 2009-04-16 Thomas, Tanja Mineralischer Wärmedämmstoff
EP2210866B1 (fr) * 2008-12-16 2021-09-15 Knauf Gips KG Construction de chape à couche fine sur une couche de séparation et isolante
US8808448B2 (en) 2010-03-12 2014-08-19 Tanja Thomas Mineral heat-insulation material
CN114163204B (zh) * 2021-11-23 2022-09-09 北京金隅砂浆有限公司 一种无砂型石膏基自流平砂浆及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785988A (en) * 1953-04-21 1957-03-19 Sonneborn Sons Inc L Surfacing materials
DE2247756A1 (de) * 1972-09-29 1974-04-04 Boergardts Kg H & E Estrichmasse auf gipsbasis fuer fussboeden
DE2437577B2 (de) * 1974-08-03 1977-07-21 Zahner, Pierre Willy, Mies (Schweiz) Fussboden
US4102697A (en) * 1975-07-09 1978-07-25 Sumitomo Chemical Company, Limited Fluid plaster composition
DE2557594C3 (de) * 1975-12-20 1979-08-09 Hoechst Ag, 6000 Frankfurt Selbstnivellierende Baustoffmasse auf der Grundlage von Calciumsulfat- a-Halbhydrat
DE3035590A1 (de) * 1980-09-20 1982-05-06 Ruhrkohle Ag Blasversatz von (alpha) -sulfathalbhydrat und/oder (beta) -sulfathalbhydrat
DD159322A1 (de) * 1981-06-01 1983-03-02 Dieter Altmann Zuschlagstoff fuer die herstellung von fliessanhydritestrich
DE3239768A1 (de) * 1982-10-27 1984-05-03 Huels Chemische Werke Ag Verfahren zur verbesserung der fliess- und foerderfaehigkeit von feuchten calciumsulfat-niederschlaegen

Also Published As

Publication number Publication date
EP0330976A3 (fr) 1991-08-07
EP0330976A2 (fr) 1989-09-06
DE3806854C2 (fr) 1991-02-07
DE58902732D1 (de) 1992-12-24
ATE82562T1 (de) 1992-12-15
DE3806854A1 (de) 1989-09-14

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